Straight-line-lift pump jack



. June 16,1925, 1,542,763 w. J. COLEGROVE ET Al.

lS'IVRAIGHT LINE LIFT rPUMP JACK Filed Feb. 5, ).924

` ments in' Straight-Line-Lift Pump Jacks,

latentled June 16, 1925 p J. coLnGaovE AND LEVI ALVANDERVooRT.

0F RANGER, TEXAS, ASSIGNQRS jky QI TEXAS.`

n ,sTBAIenT-LINL-Lir'r PUMP JAcx.

" 1 "animation nie'areb'riiary 5,-1924; Yserial No. "690,825,

To V`all whom'z't may concer/rv.'

Be it known that we, WILnIAM J. CoLa- Gnova `and LEVI A. VANnnnvooR'r, citizens of the UnitedStates, residing at Ranger,in the county olf-Eastland andState of Texas, have invented certain new and yuseful Improve o which the following is a specification. f Our invention lrelates to pump'jacks and more particularly to straight line liftpump jacks; and thefobject is "to provide Vpump jacks composed of a combination of levers, links or fulcr'um bars,'and" lpins and fulcrums so arrangedfandassembl'ed as to'y give a straight vertical lift on thepu-mpingrods, the maximum and minimum being obtained through' theV proper ratio of levers, links andpinsor ulcrum's; to provide' a pump jack in whichthe maximum lengthof stroke i'sregulated according. to' thesize ofk the pump jack `andthedi'stance between fulcrum points and length of levers; to provide a pumpjack in which there is a direct vertical lift so that by eliminating A`all side sways on the polish rods, lfriction on the stuiing box and polish rods will be reduced to a minimum, thereby7 eliminating waste through leakage around the polish rod and stuffing box which, in other structures, is the result of constant friction between polish rod and side of stufling box; to provide a pump jack which is simple in construction and in operation and which can be operated with a relatively small amount of power and which is capable of operating at a higher degree of efficiency on account of there being no particular limit-to the Vlength of stroke which can beobtained; to provide a pump jack in which the amount of fluid raised will be increased over approved methods now in use on accountr'of the long straight Vertical line lift which can be obtained; and to provide a pump jack in which the minimum amount ofstrain, jerk or jar is produced on the pumping rods because of the slowmotion with which the rods and column of fluid is started in motion, the speed being increased to a maximum near the center of the' maximum stroke, slowing up again at the top of stroke, and giving the reverse motion onl travel back to starting point.

Reference is' had to the accompanying bars 11 drawings which form a part of this applicat1on.`"- l Fig. 1 is a sideelevation of a pumpjack constructed in .accordance with ourinvention.'v Fig, 2 is a front elevation of the-same.

Similar characters of reference are -used toindicate the same parts throughout the several views: Y'

l The pump'j'ack is provided with base irame members 1 and 2 and uprights Brand 4 attached'thereto and braced by web gusset plates 5 which are attached to uprights l3 and 4 andto the 4base frame members 1 and 2. An Vangular 'brace 6 isv attached to `upright 3 and'to `base frame member 1. A similar angular brace 7 is attached to upr1ght'4 and to basev frame member 2. The uprights 3 and 4y are braced by a cross-beam 8 atfthe lower or bottom ends `and by a crossbeam i9- at` their upper ends. The crossbeams Sand 9 constitute spacing members.

The operatingmembersfinclude a pair of fulcrum bars 1() whichk are pivotally connected toi-the push bars 11'-and tothe pull bar V12. The bars 11 are pivotally connected to the cross-bar 9 which serves asr a fulcrum 'for the push bars 11. The pull bars 12 are pivotally 'connected to the cr0ss-bar 8 o which serves as af fulcrum for the bars 12 and the bars 12 are pivotally connected to the fulcrum bars 10- by bolts 13. A pair of operating bars 14 are attached rigidly to the pull bars 12 by webs or flat strap bars 15 and the bars 14 are provided with a power transmitting bar 16 for operating the pump jack. The fulcrum bars 10 are connected by a lifting bar 17. The bars 12 and 14 are braced by bars 18 which are attached to the ends of the bars 12 and 14, forming triangles and' pro- 'viding relatively long leverage by which great power is obtained.

In operation, the bars 12 pull on the upper ends of the fulcruin bars 10 and the push on the lower ends of the bars 10. This compound application of the power causes the lifting bar 17 to move vertically 4upward on a power stroke, and when the power stroke is completed, the action of the bars 12 and 11 is reversed and the lift bar 17 moves vertically downward. It is apparent that power may be applied to the bars l1, approximately at the points 19. It is apparent that the operating elements for causing a vert-icalk movement 'ofthe liftirmf bar may 30e applied to both Vsingle an? double acting pump jacks'.

Vhat We claim, is,- 1j. vfg'vutnp"ja'cl comprising fra-ine ful- @sarszasd a combi-'ed mem-m mi :1in bar carried thereby, and means operatively connected to said fulcrum bars and frame for reversing said fulorum bars and simultaneously elevating the same.

52, AA pump jack comprising .a framenof horiz'ontal and upright members, reversible 'julcru-m bars #and a combined ulcnum and lift bar `carried thereby, operating levers fulcrumed -on saidilame members aft their juncture and ,pivotally connected to said fulcrumbalis'at one end thereofand link bars pivotally "connected to the upper end ofsaid ramejand piyotally connected to the other end-s otsaifd tul'crurn bars and cooperating with said levers to lift said ulcr-um bars and simultaneously to reverse the fulcruin bars :as they are elevatedo-rfeausing direct vertical movement of said lift-'Iban 1 )pump comprising a frame, levers u-lerumed 'on Asai-d fra-me, ulcfrum Ibars pivotally connected at their ends to sai-d Flevers, a.f ule17ufm ca r-iji'ed in the central portions vof said ulcru-m bars and serving Vas a lifting bar, means for Vactuating said levers, said levers coLo'rdinating with said 'itulorum bars to produceA on saidlifting fbar a slow movement produced by a relatively leigh ratio of said levers ffor giving a ,pow-

erful lift to said bar as compared to power applied at the beginning of movement.

el. =A-,pump jack comprising la `frame, fulcr'um .bars .provided WitE a fulcriim serving as a lift bar carried thereby, means for suspending said fulcrum bars consisting oit pulling levers connected to frame 'to said fulcruni-Joars Lat one 'end thereof,

and .pushing levers pivotally Jconnected t0 said frame to the other ends of said fulcruni bars, said pulling levers and pushing levers co-'operating With each other to reverse said uler-um bars and simultaneously g elevate the tsame.

ouin-p Ajack comprising.a frame, fulcrum bars provided with a ulcrum serving as 4a lift b'ar carried thereby, a pair of Vangular levers ]Jivotally connected Ato the 'lower par-t of said L trameand to Vsaid fulcrum Abars at one end thereof,.and a pair of pushing bars ipivotally connected vto the upper partof said frame and to lthe other end ol said fulcrumbars, and an actuating bar ffor said angular levers.A

6. A pump jack comprising `a frame, full Crum bars and a ,ujlcruni there-.for in the central portions Yof 4sai-id bars `serving as a lift bar, fand levers V.pivotally connected to the ends of said `fulcrum bars `and to said frame .for elevating said lift bar and simultaneously Vreversing said fulerum bars.

In 'testimonyvwhereof, We :set our hands, this l-Stliiday of January, .1924.

WILLLAII 31. 1CQLEGRQVE- f LEVI A. VANDERVOORT. 

